The Collaborative International Dictionary of English v.0.48:

Hyena \Hy*e"na\, n.; pl. Hyenas. [L. hyaena, Gr. ?, orig., a
   sow, but usually, a Libyan wild beast, prob., the hyena, fr.
   ? hog: cf. F. hy[`e]ne. See Sow female hog.] (Zool.)
   Any carnivorous mammal of the family Hy[ae]nid[ae], doglike
   nocturnal mammals of Africa and southern Asia, of which three
   living species are known. They are large and strong, but
   cowardly. They feed chiefly on carrion, and are nocturnal in
   their habits. [Written also hy[ae]na.]

   Syn: hyaena.
        [1913 Webster]

   Note: The striped hyena (Hy[ae]na striata) inhabits
         Southern Asia and a large part of Africa. The brown
         hyena (Hy[ae]na brunnea), and the spotted hyena
         (Crocuta maculata), are found in Southern Africa. The
         extinct cave hyena (Hy[ae]na spel[ae]a) inhabited
         England and France.
         [1913 Webster]

   Cave hyena. See under Cave.

   Hyena dog (Zool.), a South African canine animal (Lycaon
      venaticus), which hunts in packs, chiefly at night. It is
      smaller than the common wolf, with very large, erect ears,
      and a bushy tail. Its color is reddish or yellowish brown,
      blotched with black and white. Called also hunting dog.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hunting \Hunt"ing\, n.
   The pursuit of game or of wild animals. --A. Smith.
   [1913 Webster]

   Happy hunting grounds, the region to which, according to
      the belief of American Indians, the souls of warriors and
      hunters pass after death, to be happy in hunting and
      feasting. --Tylor.

   Hunting box. Same As Hunting lodge (below).

   Hunting cat (Zool.), the cheetah.

   Hunting cog (Mach.), a tooth in the larger of two geared
      wheels which makes its number of teeth prime to the number
      in the smaller wheel, thus preventing the frequent meeting
      of the same pairs of teeth.

   Hunting dog (Zool.), the hyena dog.

   Hunting ground, a region or district abounding in game;
      esp. (pl.), the regions roamed over by the North American
      Indians in search of game.

   Hunting horn, a bulge; a horn used in the chase. See
      Horn, and Bulge.

   Hunting leopard (Zool.), the cheetah.

   Hunting lodge, a temporary residence for the purpose of
      hunting.

   Hunting seat, a hunting lodge. --Gray.

   Hunting shirt, a coarse shirt for hunting, often of
      leather.

   Hunting spider (Zool.), a spider which hunts its prey,
      instead of catching it in a web; a wolf spider.

   Hunting watch. See Hunter, 6.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hunting dog
    n 1: a dog used in hunting game